Serious Eats: Talk

Anybody know what this "special" offal is, in the Asian market?

I was in the Asian market the other day, and I saw the usual things in the meat aisle, including "pork uteri". Next to them, however, were "special pork uteri", a little larger, and priced a little more. First time I have seen this, in all the years I have been going there. The only thing I could think of is that these things are fertilized! I googled them, out of curiosity, but got nothing. Anybody know what these are?

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